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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c5826b646d2a600a68d0e00c55270d08d40dd6527230ef6d06b205291795a3' 
  AND token = 'VblZS6k5zGpoMm57zVo0fPVzl/PAdsOpo9FrEeb2ckw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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