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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d290a8cdaf7872e56c40a3e295a1899db79b03f6db705f777d27e5fb285f5f3' 
  AND token = '26rzyz09XpNIBebawI3tLo4ZnsfZSA9NhA55nI0LAdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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