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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13997d6321712542f81603470639d09d32bd2f6b280e1c6462bab97adbf4cfc' 
  AND token = '8Tkp9BHFjlcSGo4FCvTF/6xEvJeNFCpFs8y6GFe82jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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