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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a08da9ec992d4b6c00dab013859bed9796904b8162c8d5c0164a493968bbaf9' 
  AND token = 'ei7MIvyPnEqglVr9t45r8IBdG8U/tSX5ceOmJrEq0qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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