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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8154fe1ec5510c34bd326a794e6b39f9d0947093d6f489923d781d0a06dd20' 
  AND token = 'DmiHNCD0mwYFxWubxXLZSEDvIu1xcDUgB/fDM6NPfYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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