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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e1d811ff99b89a73687d0344f3e1fa140cf571d17915fca885fb8d3b80d883' 
  AND token = 'sCqe/oaT+eW+HeS3DfHRhJcbXKPyyhF9RevvLsLTP4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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