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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db348c59b4ad183aadfd4be7f7db756e56e2d0f6a332690e24d63341af699f3f' 
  AND token = 'ClEfK/DP2EMG0jtkn/FojiayHjXBxXO+PGwP2AviZno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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