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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ba57ec032264d9de90769121774a9bd11c3701c38bc07a9310c69384898102' 
  AND token = 'gMgpDPdYXZXvlv/SeARVmj4YTwd3byl06ZnbgQwiSO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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