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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec6174c9b3af79d0bfa37921319b4a7284e5fce761f6d3a010cfe9174dd0ffd' 
  AND token = 'BuNq6Sg9SUfihu7dBKkyVWPtAILnWrzjqbPzgEAXCgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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