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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8f31788559de3da2a88d57c083d6b766aa662504c75515311bbad56cb9ae70' 
  AND token = 'pXCWfF6vJxQK5MTX3K605rI1lWPBlY7u5uamAtTl+sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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