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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c352443767f5799fa6a86d0a2132f02deb8de6e98676bd333779c06c24fe00e' 
  AND token = 'r/ZYjScRBSM4sn7OSpLVTxQMiFSkJuI4V2/7rkjkR4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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