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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd8c8e6ec38df16b628ee6998a80bdd13ffdbd18ebe39a7ff9629cf1ecc5826' 
  AND token = 'ofuCuwtttDsUEi/fDjWc+KG5is6LhjmK+v9T+CHk1mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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