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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8586090bf493d1769cf4bc6a8900e6e5b18926dfce92f836c7ef9557beca3e8e' 
  AND token = '8Acer9jfxTOZVhv/rI6eS4N/X5XE0uYFTVpSiZDqcCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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