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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c353887584c886a2cd67030f6d0363ef84e7ed9d74265a6bd80ace1fb160c94c' 
  AND token = 'OTlf8cc0W/J7K38IBe6gEtHLw+hvLXc1cia3MCAttk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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