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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a3c29fef35e96fa22d26b3074dd00b2e9f65d11374b6ef1eecf7bb0324bbd8' 
  AND token = 'c/XUAfTRbovQADAp8aZEvwJ9/K7b0Zs7kmr4VIPceIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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