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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13a79b02760cb101f77a94ec13f841060a0b1163346fb4b81107f77cb0d786c' 
  AND token = 'aGapP8CSPpE84GSAhxSBK6vKDni32OhRDSPGu3WF3Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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