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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae39aa8a58cde969663a1ccea9e43a1cee9a791cdd12a0836e0b26f5a9ebee78' 
  AND token = 'EHIs2f+G6TOLrFYi0UBd0Kyagm1+U1NHU1MHffa9jtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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