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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3712aea6855fba1624da459ad194d9301ad84c55747516522c1cb08b3a2cc1f3' 
  AND token = 'CvvmOgFMWjEMVQJnCWBMMebQ+ZjLOW6Ey4CVMn2ru3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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