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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f888c7134c50c9ee206d0e812e452b9d5fe380bf83586bdff1de5761a9e49b1' 
  AND token = 'WVgDLdlMDIRO77DGpNh/04Bs3SY69hyoUznJfcKi55c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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