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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73cc2a5a46acedaea721e5f5bb3d96b074e27dabf19150474ec5df0b8f02833' 
  AND token = 'W1CYB7v5TXsy+IzB/6ZY3atpyO5TcnpFcQ3ZI7kZJMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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