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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d464d0e5c1d65fbb422709c886011093043496ac9e8023cb92258ce011c0f1' 
  AND token = '+W9BtdVJU0OPDUpo373GmgdvBxrmK9mXrYLFaBI8JIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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