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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f89ab46b216897cb2d6c52fe0afee84c61eb332341304deacfa57c123071a15' 
  AND token = '19rR5R5BOuPh6kPy7fmHfAQBTe3tyqFYgjYCo3raDjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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