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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bef926ca2d66bf596f53c5795956325f35761b4167124c17c0831503d9e41f5' 
  AND token = 'K1c58cBip/dlubnWtl7spIdHVXTgQmZW8LCPdDewds4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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