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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd13a2fabc301cf3ad75dbca9c0a1f432162215179c49223b4a71ec2850acdbe' 
  AND token = 'DSlTR0hBWydxdqFmZS1+d1wviXW9C8ti3CMJh5/afbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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