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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af30bf84237e7ecbe4f4cc858f0a7fe1d06d78e8eadc8926751038f1c22c1618' 
  AND token = 'g0n6fLYYBuUDn12JMEcJPS64fZFSyq401RL6rlUP/mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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