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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6103a72193dcab4e3569648d0f32fd946d8e594dc16d9297973940694b34948a' 
  AND token = '9P6zcBCcp0e1TliiU/lSsMUd8LYQ+eNFOCERjXvde9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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