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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27ce667697ee12dc967f8b62f385c0e79bcedc41ffa54ea30bc4d7b99c424e2' 
  AND token = '+nbmBEKsv5SuyZpp9OdI70ErcokWKPIR/KtMeo1FBX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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