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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c30371af718f9b6d294d41e380e1b6194a161bc91ec246b7e24485e0d220009' 
  AND token = '9iuaoZW73qc7zAMVw8eYPI1UmgvsqGywHCG2M4twahU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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