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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f34f7278ae5aca643132a50bca482da92e6b5ac8d526859662c0aedd552c7d5' 
  AND token = 'rXGj53SX3qhxV72+v7YD/6dfKP2ppKzznne1dRyHYLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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