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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5bce7ead3f4109346cacfd8682d339fcba6792d94659c1d3097f0711778cab' 
  AND token = 'MV5ZXGFwI9S4JYs3xKTUEbZviNOor3Y5iXXPkNBao3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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