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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25d4864f85d4cce07c11bd66e0030689ce626a8f9cadf3adb0b761ea201bfa9' 
  AND token = 'NW1htOUmjizvWt9a8BFZOyTL1AQD2hdswnp/OXBINA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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