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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a1b27b0be60ab654e50e5c8a2c0596e059b2733eae9c7ca099295672cba8e4' 
  AND token = '4D2LRb/yUmoALNzBhpjR3KuY/AYP4XA7LDA5C8UN/x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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