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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb42c79845ca611f40d128f4e4d841f8d079d799c8a57fde22291bd6bffac11' 
  AND token = '9ME84d14pQ1akLWSAcuHyO/JT8YiGsNJErOjtEo4peE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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