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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1f872ca9eff9540854c8be8b2c92b53cad795d1e974e2ed533fec25ccee7a0' 
  AND token = 'UlZUxqrfxGyR+ZijT3ZjMhLB7F8jTClaNYUVOXx4Ajg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}