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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b0164f76536987066a2dc5e7fa95d451eb6a9e3761623da6bfe6e61d71ed46' 
  AND token = 'mCQpbu3gE2ImhwxqpXOinRLpwg//suPw8VxgrfYhvbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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