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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2381eb2de567510d57553eb0bf53e2c9766d24ca4434ed441a5f6a074b7b58' 
  AND token = 'dtszz6FwMaisi8thDDnf40IkA1ik1QvOGBJt8Czf0Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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