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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e212ca46e18996b39c1d7711f7e3eddea1351a8822215e134665fd6f4af5599d' 
  AND token = 'kfTuvev3Rimig62GYcxcNJgiIjpGIpRbNRRFSnc1Fpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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