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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b413de2b615f4a6025a4dec7288397949ae075e5d62ff8d6152f67a869eaa4a' 
  AND token = 'kAHyarSQKt6NEYFfMisBDCcAkmJqT2D0EI5SzHAR/ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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