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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7bd69212c8764d5fb030405b11070f56a3d29b20710a8bcd21fbf3195e66c5d' 
  AND token = 'Xzn+m3/Et+6qiPsWvdII0Oq817IR3fRXLRkJk4jZQZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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