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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add853759031099ade1d47f9f3cc21c2f7ea1c475dfaf55e98d18780c4993bf3' 
  AND token = 'CNV1neDfRv57GU8q/UZRE6xI90WnIRgo0DSHTMFpYe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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