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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e57c3cf76697e0b9b01d9f7df43783682997f18ecffb6273513fcabeaa79cd2' 
  AND token = 'bJ515KK7Fn5yZUk8CA23XqB3Sw46ClzI7p4yvKpNMmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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