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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4a5e8e714a9b0add2a328db8fe70857f69dc55550784a523db5e00ba51ae02' 
  AND token = 'c+NDSegpb872vcIujtxbeXFgwWi2tRuDmh0f9O2Jqx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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