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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ddf426c843a1ca03827f616acd8c08d5964ae82431b22c8f57a8d5be3554cd' 
  AND token = 'gLukPFkDZekGGtB2DPXEnbyVWxD9K5q4G9RVGC4+Kxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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