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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3a6d667dde638c0f1e0638468107c78460fb90b1d1532e702ca4adae7be2da' 
  AND token = 'RBREcHOG08mL0a9J5pr02qzrlF84l3xL9txvIGDUuyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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