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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ca8f7fa99a9b6276dfa56b10c9be1369e4bf6fc9e117574bc8882567142821' 
  AND token = 'Wr838LGqXUgBU8U6boJFP/XLycXdLZsTbTfCaId4b5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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