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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c510e118d854d5d37f8bab52d52419c9b54224610d2850b32d7ae5cd9286bf' 
  AND token = '8ZTJ3Ho3YUG95xM3FXWUwunFylRX1VG5aonp3aCxchM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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