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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7892d5ab1d4671fce25a8991c03e240246aa02f2fe0d04ee1a5f5f50696fc5c' 
  AND token = '/Rk8AVFMbEKmfhqdU6UxQLC9Tqr9C1Kkf6Lf6ZmiwEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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