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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c106fc81ad868a1f5f438b8815a4cf2ba5c3df4526ce4b1ff4d9c199508cbb' 
  AND token = 'kwW+2+m8x+9vLkW93lG8AVyKKb1yey1l2Qr5GMXoE/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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