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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613e82489e1df4a33bf7ddef173172f2dda12627ae050dcf0b0f14be3c544875' 
  AND token = 'D2QeWEFI+XpZUZh+m1NOz+nQT3i5X3shljzVMEYu3Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00128

JSON explain

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