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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a13868c5f5f78c1902d2da94ac05d77b6af58c2520f7079c652f950f204ec6' 
  AND token = 'DeJ4h+SS9/GvSv/oqDmq0UKHKdEk4nDeqY4g/8c5HlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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