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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6a0710345f5599de0e7a53f86105bb89e3fa4298cd7e60ca40a2af8e95cd44' 
  AND token = 'CPktrouRs4nGC0ddiJgIa/hUdNM9TYyl2FzwgfhW4vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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