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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a7392993909b1f790894d137c1796f90e9ef149a0634de7f8d07b098069de2' 
  AND token = 'KdCQwGPXU/B6vLlqBH3M1tsgRMdp7IvQOE9QQGqAv9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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