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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '618a4c9fa3d6f64c350ded4fb1079ba7fb10e35c8bbdb3366d716b89c562d363' 
  AND token = 'Mz2P3RL0QXRKyQrgzXz/ua/MFN/QlpNhPUMtpJT98Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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