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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7afb5c04cc3a25751f34c574bd48e0560c1a980129a3dd1f9216d3c58583fc5c' 
  AND token = 'LZSfE0FIr8OmJTDqT+F2rpFL2fcAoEuh4/6RTeP4KeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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