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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd9e6f222d3236eeaaacafaab6d27b0016136da4cad4e4d3527f48b31c99cc5' 
  AND token = 'y+wym1e2/TO0ECcAhf0sNHS3r+v0vT5Cb/g/seWWHCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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