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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5e8806ea7f7b3585289d37fba52390bc943c4c1d3bfc5f8d67037dd1b12734' 
  AND token = 'xV35YNJnzwCNbKbJLoEgRp2yXA7hcOO1NdDddqxsUy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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