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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f36c8d95314f2b3303ae95cac0569a0f2f75e8a07ebae5231e4d246f2b108b' 
  AND token = 'hH+Z84P9TPNkPYso3M4jXK148l45Qna2d4cCd78HD2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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