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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb80c91579ce71dc40eb779be9aa38503c71925edb01bcb11b0390d8450177c' 
  AND token = 'm2aXnqeDSZl4R8/WYNwZtSiINd90kC1NPjt7asl39UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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