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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec8cafa34db389873cd4fd8781a8c2a1f6360607284022f7f8c0d20f04db630' 
  AND token = 'vmnPTXwhpuVby83NYxGXkg93VDM80ckA2PSsR/H20as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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