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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b724599ddd05e9613494d1eb8ec591ccebf6830e0a2ca931ee50c879c9924312' 
  AND token = 'dAgY3/2mqstFFX9NDREc8mTZxeqk4szM4gf7JYea+6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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