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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c18d7723e6fe68ba6ba6f981d1b5c47813ac456e2d536fd9ffc8bbd3e76ff90' 
  AND token = 'hs2Va1WZXEcvisUahwOzzdfpWPamTQ01iP/sM3q5nQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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